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Eye Tracking in MEG.

Veli-Matti Saarinen¹, Veikko Jousmäki²

¹Aalto NeuroImaging, Neuroscience and Biomedical Engineering, Aalto University, Espoo, Finland. veli-matti.saarinen@aalto.fi.

Attention, Perception & Psychophysics

|January 30, 2024

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Magnetoencephalography (MEG) and eye tracking can be combined for advanced brain activity analysis. Careful setup is needed to manage electromagnetic interference from the eye tracker within the magnetically shielded room.

Area of Science:

Neuroscience
Biomedical Engineering
Cognitive Science

Background:

Magnetoencephalography (MEG) offers millisecond-level temporal resolution for brain activity measurement.
MEG sensors are highly sensitive to magnetic signals but susceptible to electromagnetic interference (EMI).
MEG systems are housed in magnetically shielded rooms (MSRs) requiring specialized equipment shielding and placement to minimize EMI.

Purpose of the Study:

To explore the integration of eye-tracking technology with Magnetoencephalography (MEG).
To address the challenges of electromagnetic interference (EMI) when using eye trackers within a magnetically shielded room (MSR).
To enable advanced neuroimaging applications by combining precise brain activity measurement with eye movement data.

Main Methods:

Keywords:

Eye tracking Magnetoencephalography

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Utilizing eye-tracking devices to record gaze position, pupil diameter, and eye blinks.
Implementing specialized shielding and strategic positioning for the eye tracker within the MSR.
Considering subject-specific factors such as makeup and corrective lenses for optimal data acquisition.

Main Results:

Demonstrated the feasibility of combining MEG and eye tracking for enhanced neuroimaging.
Identified critical parameters for mitigating EMI from eye trackers in MSR environments.
Established protocols for subject preparation to ensure data quality.

Conclusions:

The integration of eye tracking with MEG is achievable and offers significant potential for research.
Careful management of EMI through shielding and positioning is crucial for successful integration.
Further research can leverage this combined methodology for detailed cognitive and neurological studies.